Other related questions:

The reason why the CPU usage of the AR3260 is high may be that the AR is attacked, which can be identified as follows:
1. Run the display snmp-agent statistics command to view SNMP statistics, and check whether the number of SNMP packets received on the AR exceeds the queue buffer and some packets cannot be processed.
2. Capture packets to check whether the AR is attacked.
For details, see CPU Usage of an AR3260 Is Too High.

Huawei AR routers can connect to Cisco devices through IPSec tunnels. This example applies to all AR models of V200R005C10 and later versions. For details about the configuration process, see "Example for Configuring the Headquarters to Manage Branches (Cisco Routers) Using Efficient VPN and Establishing IPSec Tunnels" and "Example for Configuring the Headquarters (Cisco Router) to Manage Branches Using Efficient VPN and Establishing IPSec Tunnels" of "Using VPN to Implement WAN Interconnection" in Typical Configuration Examples.

The AR connects to a Cisco device using a dynamic template. For details, see "Example for Establishing an IPSec Tunnel Through Negotiation Initiated by the Branch Gateway with a Dynamic IP Address to the Headquarters Cisco Router (Using Dynamic Crypto Map Entry)" of "Using VPN to Implement WAN Interconnection-IPSec" in Typical Configuration Examples.